Calisthenic and gymnastic exercises with biomechanical descprition

Abs

Although the rectus abdominis muscle contracts as a single unit in any exercise that requires spine flexion (bending the spine), when we do exercises that include bringing the hips towards the trunk we focus on the lower part of this muscle – like the hip raises in this video, while if we bring the torso towards the hips the upper part of rectus abdominis is working more.

The rectus abdominis muscle is split vertically in two by the linea alba; this muscle is also split horizontally by tendinous intersections => this is what we commonly refer as “six pack”